In Yogyakarta City, the most waste comes from markets and settlements. One market that produces
highest waste is Kranggan Market which produces 95% of organic waste, containing vegetables
and citrus fruit waste. The purpose of this study was to determine the effect of ingredients
composition of citrus waste on the chemical content (N, P, K and pH) of organic liquid fertilizer.
The study was a quasi experiment with post test only design. The study data was analysed
using one way anova at 0.05 significant level, and the results show that the N content obtained
p-value 0.961, the P content was 0.962, the K content was 0.948, and the pH was 0.702. The N
content had the highest average at 2 kg, i.e. 0.08%; meanwhile the K content was at 3 kg composition,
0.05%; and pH was at 3 kg composition, 3.7. It can be concluded that the all compositions
have not meet the required minimum standards, meanwhile the P content has fulfilled
SNI 19-7030-2004 with standard >0.10%, i.e. at 1 kg composition has an average of 0.10%, at 2
kg composition, of 0.11%, and at 3 kg composition, of 0,11%. It can be concluded that the overall
liquid organic fertilizer from citrus fruit waste have not meet the 2004 Standards. Therefore, it
advised for subsequent studies to add raw materials consists of vegetables or fruit which contain
high levels of nitrogen, phosphorus and potassium.